[LISP函数]：这么简单为啥有时还不好使啊?

max_yu_2003

请看下面一段,为何有时能用,有时不能用啊?我是想让所有关于电气的图层隔离,但是有时好用,有时就提示"函数被取消",我觉得是因为第二行的"y"的原因,我试过几次,有时是加上这个"y"好用,有时是去掉它好用,"y"是为了确认是否关闭当前层.
大侠们帮我看看怎么回事.
(defun c:2 ()
  (command "Layer" "OFF" "*" "y" "")
  (command "Layer" "on" "EQUIP-照明" "")
  (command "Layer" "on" "EQUIP-动力" "")
  (command "Layer" "on" "EQUIP-消防" "")
  (command "Layer" "on" "EQUIP-通讯" "")
  (command "Layer" "on" "EQUIP-箱柜" "")
  (command "Layer" "on" "ELEMENT" "")
  (command "Layer" "on" "DOTLN" "")
  (command "Layer" "on" "LWIRE" "")
  (command "Layer" "on" "SHTLN" "")
  (command "Layer" "on" "WIRE-照明" "")
  (command "Layer" "on" "WIRE-动力" "")
  (command "Layer" "on" "WIRE-消防" "")
  (command "Layer" "on" "WIRE-通讯" "")
  (command "Layer" "on" "WIRE-系统" "")
  (command "Layer" "on" "WIRE-母线" "")
  (command "Layer" "on" "WIRE-避雷" "")
  (command "Layer" "on" "WIRE-接地" "")
  (command "Layer" "on" "DIM-照明" "")
  (command "Layer" "on" "DIM-动力" "")
  (command "Layer" "on" "DIM-消防" "")
  (command "Layer" "on" "DIM-通讯" "")
  (command "Layer" "on" "DIM-系统" "")
  (command "Layer" "on" "DIM-箱柜" "")
  (command "Layer" "on" "LTN_WIRE" "")
  (command "Layer" "on" "LIGHTNING" "")
  (command "Layer" "on" "GRD_WIRE" "")
  (command "Layer" "on" "SIG_TEXT" "")
  (command "Layer" "on" "WRSOCK" "")
   )

不会吧,真没有人能指点一二啊